Hermitian and special structures on products of spheres

An adjustable rear lamp is disclosed to allow the adjustment of a lamp housing within the lamp cavity of an automobile's body frame. A threaded bolt is inserted into an opening in the sheet metal of an automobile. A nut is attached to the threaded bolt. The threaded bolt surrounds a threaded shaft, and one end of the threaded shaft is attached to the lamp housing. The nut and threaded bolt may be rotated, engaging the threaded shaft and moving the threaded shaft into or out of the lamp cavity. The movement of the threaded shaft and the lamp housing allows the lamp housing to be positioned precisely within the lamp cavity.